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Climate factor for small-basin flood frequency

Water Resources Bulletin

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DOI: 10.1111/j.1752-1688.1990.tb01395.x

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Abstract

A climate factor, CT, (T = 2-, 25-, and 100-year recurrence intervals) that delineates regional trends in small-basin flood frequency was derived using data from 71 long-term rainfall record sites. Values of CT at these sites were developed by a regression analysis that related rainfall-runoff model estimates of T-year floods to a sample set of 50 model calibrations. CT was regionalized via kriging to develop maps depicting its geographic variation for a large part of the United States east of the 105th meridian. Kriged estimates of CT and basin-runoff characteristics were used to compute regionalized T-year floods for 200 small drainage basins. Observed T-year flood estimates also were developed for these sites. Regionalized floods are shown to account for a large percentage of the variability in observed flood estimates with coefficients of determination ranging from 0.89 for 2-year floods to 0.82 for 100-year floods. The relative importance of the factors comprising regionalized flood estimates is evaluated in terms of scale (size of drainage area), basin-runoff characteristics (rainfall-runoff model parameters), and climate (CT).

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Climate factor for small-basin flood frequency
Series title:
Water Resources Bulletin
DOI:
10.1111/j.1752-1688.1990.tb01395.x
Volume
26
Issue:
4
Year Published:
1990
Language:
English
Publisher:
American Water Resources Association
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Water Resources Bulletin
First page:
577
Last page:
586
Number of Pages:
10